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Abstract

"Electrical conductivity and Seebeck coefficient measurements for the La1-xCaxAl1-yCryO3 system were carried out as a function of temperature and composition for the 20% Ca/Cr ratio series, in which the amount of Ca and Cr were kept at a fixed 1:5 ratio; the La0.80Ca0.20(Al,Cr)O3 series; and the (La,Ca)AlO3 series. The conductivity results for the 20% Ca/Cr ratio series and La0.80Ca0.20(Al,Cr)O3 series indicate that those systems can be related to a site percolation model in which small polarons hop between available Cr sites. This is exemplified by the temperature independent Seebeck coefficients. Conductivity is attributed to the mixed electronic and ionic compensation of Ca in the (La,Ca)AlO3 series and when y 0.80Ca0.20(Al,Cr)O3 series"--Abstract, page ii.